12.5×2.5×(80+0.4)简便计算怎么做

2024-12-25 07:14:41
推荐回答(1个)
回答1:

12.5×2.5×(80+0.4)
=12.5×80×2.5+12.5×2.5×0.4
=1000×2.5+12.5×1
=2500+12.5
=2512.5